2 is a factor of every even number. Adding or subtracting one from an even number leaves an odd number. Since even and odd numbers alternate, 2 will be a factor of every other number.
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Because every number can be created by a factor of 1. 1x1 = 1 2x1 = 2 etc.
That's the definition of an even number. If they didn't have 2 as a factor, they wouldn't be even.
Every even number but 2. Even numbers have 2 as a factor (by definition), so higher even numbers can be separated into two factors, 2 and some other number. For example, 6 = 2 x 3.
Every number that includes a factor of 2 is an even number. Every number that ends in a 5 is an odd number.
Can be divided by itself